Measurement of GEp/GMp in ep ep to Q2=5.6 GeV2

Phys. Rev. Lett. 88, 092301 – Published 12 February 2002
O. Gayou et al. (Jefferson Lab Hall A Collaboration)


The ratio of the electric and magnetic form factors of the proton GEp/GMp, which is an image of its charge and magnetization distributions, was measured at the Thomas Jefferson National Accelerator Facility (JLab) using the recoil polarization technique. The ratio of the form factors is directly proportional to the ratio of the transverse to longitudinal components of the polarization of the recoil proton in the elastic epep reaction. The new data presented span the range 3.5<Q2<5.6 GeV2 and are well described by a linear Q2 fit. Also, the ratio Q2 F2p/F1p reaches a constant value above Q2=2 GeV2.


  • Received 15 November 2001
  • Published 12 February 2002

© 2002 The American Physical Society

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